President Obama witnessed the Nazi ovens of the Buchenwald concentration camp Friday, its clock tower frozen at the time of liberation, and said the leaders of today must not rest against the spread of evil. The president called the camp where an estimated 56,000 people died the "ultimate rebuke" to Holocaust deniers and skeptics. And he bluntly challenged one of them, Iranian President Ahmadinejad, to visit Buchenwald. - 06/05/09
